<!DOCTYPE html>
<html th:replace="~{layouts/layout :: layout(~{::title}, ~{::#main_content})}" xmlns:th="http://www.thymeleaf.org">
<head>
    <title>管理系统</title>
</head>
<body>
<div id="main_content">
    <pre th:text="${content}"></pre>
</div>
</body>
</html>